JPH0535555B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a connector for mounting another printed wiring board on one printed wiring board and making a predetermined electrical connection between the two wiring boards, and further relates to Specifically, the present invention relates to a surface mount type connector that allows the above-mentioned connection to be made on the surface of a printed wiring board.

(Prior art) As shown in FIG. 11, a connector used for a printed wiring board is formed by forming a through hole 2 in this printed wiring board 1, and forming a conductive material layer 2a around the through hole 2. Conventionally, many connectors of the type in which the legs of the connector are inserted into the holes 2 have been used. However, with this type, there is a problem in that the diameter of the through holes 2 cannot be made very small due to problems such as the strength of the legs of the connector, and the intervals between the through holes 2 cannot be made very small. For this reason, there has been a problem in that it is difficult for the through-hole type to meet the demand for smaller and higher-density packaging of circuit devices disposed within the equipment as electronic equipment becomes smaller.

For this reason, as shown in FIG. 12, lands 3 are formed on the surface of the printed wiring board 1 to connect circuit elements and connectors to each other, and the legs of the connectors are directly connected to these lands 3 by soldering or the like. A Surf S mount type was devised. However, in the through-hole type, after inserting the legs of the connector into the through-hole, the insertion part is fixed by soldering, etc., so the connection part strength is higher than that of the surf S-mount type.
For this reason, in the case of the SURF S-mount type, special care must be taken to prevent external forces from acting on this connection.

(Problems to be Solved by the Invention) This SURF S mount method is often used to connect printed wiring boards to each other (for example, to connect a mother board and a daughter board). To give an example, as shown in FIG. 13, a post header 5 having a post 5a is fixed on the motherboard 4, a connector 6 fixed on the daughter board 7 is fitted into the post header 5, and the daughter board is attached to the motherboard 4. There is one in which a board 7 is attached. In this case, when the connector 6 is fitted into the post header 5, the post 5
A receptacle 6a that fits into the receptacle 6a is built-in, and the tip of a leg 6b connected to the receptacle 6a is soldered to a land 7a of the daughter board 7. When the motherboard 4 and the daughter board 7 are connected in this way, since both the boards 4 and 7 are firmly connected via the header 5 and the connector 6, for example, the boards 4 and 7
In cases where the product is warped, thermal distortion occurs due to the heat of soldering, or distortion occurs due to heat due to electrical resistance during use, etc.
It is not possible to release these warps, strains, etc., and there is a risk that stress will be generated at the connection portion between both boards 4 and 7. Therefore, this stress is applied to the daughter board 7.
This acts on the connection between the land 7a of the receptacle 6a and the leg 6b of the receptacle 6a, and since this connection (surf S mount) is weaker in strength than the through-hole type, there is a risk that the connection at this connection may come undone. .

In the case shown in FIG. 13, the connection between the post header 5 and the motherboard 4 is a through-hole type, and the mounting density in this part cannot be increased very much. cannot be made too high. For this reason, it is conceivable that the connection part with the motherboard 4 should also be of the surf S mount type, but in this case, the connection between both boards 4 and 7 would be a surf S mount type, which would prevent the board from warping and heating as described above. It is necessary to be careful not to create stress in the SURF S mount due to strain, etc.

(Means for Solving the Problems) In view of the above circumstances, the present invention provides a surf S mount type connector for connecting printed wiring boards, which prevents warping and thermal distortion of printed wiring boards. It is an object of the present invention to provide a connector in which stress is not applied to the SURF S mount portion even when such problems occur. As a means for this purpose, the present invention provides a connector housing that removably supports a second printed wiring board (for example, a daughter board) on a first printed wiring board (for example, a motherboard), and A plurality of connection contact members are movably held in the housing, and a plurality of first contacts are bonded to a plurality of contact lands on the surface of the first printed wiring board, and a plurality of first contacts are bonded to the plurality of contact lands on the surface of the second printed wiring board. A plurality of second contacts are bonded to a plurality of contact lands, and when the second printed wiring board is supported by a connector housing fixed to the first printed wiring board, the connecting contact member is formed on the connecting contact member. Connect the first connection part to the first
A surf S-mount connector is configured by bringing the second connecting portion formed on the connecting contact member into contact with the second contact.

(Function) In the present invention, the mounting density of the printed wiring board can be increased by adopting the SURF S mount, and since the above-mentioned measures are taken, the lands on the first printed wiring board can be increased. The first contact bonded to the land on the second printed wiring board and the second contact bonded to the land on the second printed wiring board are connected via a connecting contact member that is movable within the connector housing. Even if warping or thermal strain occurs, this warping or thermal strain can be absorbed by the free movement of the connection contact member, and the connection between the first and second contacts and the printed wiring board Prevents stress from being applied to the joint with the land (surf S mount).

(Example) Preferred examples of the present invention will be described below with reference to the drawings.

1 and 2 both show a SURF S-mount connector according to an embodiment of the present invention, with FIG. 1 showing the state before connection, and FIG. 2 showing the state after connection. In this example, a daughter board 7 is attached to a motherboard 4 having a plurality of contact lands 4a on the surface thereof at substantially right angles to the motherboard 4. This connector includes a first contact assembly 10 having a plurality of first contacts 11 that are bonded to each contact land 4a on the surface of a motherboard 4, and a first contact assembly 10 that is bonded to a plurality of contact lands 7a formed on the surface of a daughter board 7. a second contact assembly 20 having a plurality of second contacts 21, and a connecting contact assembly 30 mounted on the motherboard 4 to support the daughter board 7 and to establish an electrical connection between both contact assemblies 10, 20. Consisting of

In this example, two first contact assemblies 10 are mounted on the motherboard 4, and each assembly 10 is configured by a first contact holder 12 holding a plurality of first contacts 11 in alignment. FIG. 3 shows this first contact assembly 10 in detail. In this figure, the assembly 10 on the left side shows each contact 11 held by the contact holder 12, and the assembly 10 on the right side shows the contact holder removed. Indicates the condition. Each contact 11 is made of an elongated metal plate, and as shown in the figure, a plurality of contacts are arranged horizontally in a vertically extending state, and are held in this state by a contact holder 12. The lower end of each contact 11 is bent by being alternately distributed left and right in the order in which it is arranged in the horizontal direction, and the leg portion 11 is bent to be connected to the land 4a of the motherboard 4.
a is formed. On the other hand, the upper end of each contact 11 is arranged in an inverted U along the upper part of the contact holder 12.
It is bent into a letter shape to form a contact portion 11b with the connection contact.

A fourth contact assembly 10 is shown in detail by sectionalizing the first contact assembly 10 along the arrow - in FIG.
As can be seen from this figure, the contact holder 12 has an upper holder 12a and a lower holder 12.
It is composed of b. The lower holder 12b is made by injection molding.
The metal plate forming the plurality of contacts 11 is attached to the leg portion 11.
They are made by bending and forming only the parts a and arranging them side by side in the horizontal direction, and then injecting the inner side of the leg part 11 in this lined up state as shown in the figure. As a result, the plurality of contacts 11 are held in a horizontally lined state. Note that at this time, the upper part of the contact 11 is not bent, but extends straight upward.
On the other hand, the upper holder 12a is connected to the arrow − in FIG.
As can be clearly seen from FIG. 5, which is a cross-sectional view along Each upper end of the contact 11 is inserted from below. Next, the contact 11 is placed along the upper end surface of the upper holder 12a.
The upper end of the upper holder 1 is bent into an inverted U shape.
A portion thereof enters a guide groove 12d formed on the right side surface of 2a in the figure, forming a contact portion 11b.
As described above, the first contact assembly 1
The first contact assembly 10 made in this way has each leg 11a soldered to each land 4a on the surface of the motherboard 4, and this connection makes it possible to connect the first contact assembly 10 to the motherboard 4.
mounted on top.

Since the first contact assembly 10 is made as described above, one first contact assembly 10 can connect to two rows of lands 4a on the motherboard 4, increasing the mounting density of the connectors. I can do it. In other words, as shown in FIG. 12, the spacing between the lands 4a on the board surface cannot be made very small due to the necessity of providing a wiring pattern between the lands 4a, but each contact 11 has its legs. Since the portions 11a are connected to two rows of lands 4a and the contact portions 11b of each contact are arranged in one row, the connector can be made smaller and the mounting density of the daughter board 7 on the motherboard 4 can be increased. I can do it. In this example, the lands 4a on the motherboard 4 are arranged in a staggered manner with a half-pitch shift in each row to facilitate the arrangement of the contacts 11; The contact portions 11b of the contacts 11 may be aligned and arranged in a grid pattern, and in this case, the contact portions 11b of the contacts 11 may be formed offset with respect to the leg portions.

The second contact assemblies 20 are mounted on the daughter board 7, and corresponding to the two first contact assemblies 10, there are also two second contact assemblies 10, and they are mounted on the front and back surfaces of the daughter board 7. each installed. This second contact assembly 20
has the same structure as the first contact assembly 10, and includes a plurality of second contacts 21 aligned and held by a contact holder 22. FIG. 6 is a detailed cross-sectional view of the second contact assembly 20. As can be seen from this figure, the contact holder 22 consists of an upper holder 22b and a lower holder 22a, and the upper holder 22b is an injector. Made by mold. This is in an upside down relationship with the first contact assembly 10, and each contact 21 held in an upper holder 22b made by injection molding has a bent leg portion 21a at its upper end. On the other hand, each contact 21
The lower end is inserted into the through hole 22c of the lower holder 22a and is bent and formed along the lower end of the lower holder 22a to form a contact portion 21b. Note that at this time, a part of the contact portion 21b is in the guide groove 22d.
Go inside. The second contact assembly 20 configured as described above has each leg 21a soldered to each land 7a formed on the surface of the daughter board, and is attached to the daughter board 7 by this joining. . In this case as well, two rows of lands 7a on the daughter board 7 can be connected by one contact assembly, resulting in a high packaging density.

On the other hand, the connecting contact assembly 30 is composed of a connector housing 31 fixed onto the motherboard 4 by bolts 35, and a plurality of connecting contacts 40 that are freely movably held in two rows within the connector housing 31. has been done.
The connector housing 31 has a board support groove 32 extending laterally in the center thereof, and the lower end of the daughter board 7 fits into the board support groove 32 . This allows motherboard 4
The daughter board 7 can be detachably supported via the board support groove 32 of the connector housing 31. Connecting contact holding spaces 33, 33 extending laterally are formed on both sides of the board support groove 32. FIG. 7 shows the right side of the connector housing 31, and as shown in this figure, the connecting contact holding space 33 extends laterally and has an opening in the vertical direction. A plurality of slits 33a, 33b are arranged in the horizontal direction on the side wall.
is formed. These plurality of slits 33a,
33b holds the plurality of connecting contacts 40 inserted into the space 33 side by side at a predetermined distance from each other.

8 and 9 are cross-sectional views showing a state in which the connecting contact 40 is inserted into the space 33 and a state in which it has been inserted. As can be seen from these figures, the left side wall 31a of the connector housing 31 in the drawing is
The upper end of the right side wall 31b projects inward (to the right), and the lower end of the right side wall 31b projects inward (to the left). For this reason, each connecting contact 40 is connected to each corresponding slit 33.
It is inserted diagonally from the upper right into the space 33 defined by a and 33b as shown in FIG. The inserted connecting contact 40 has side surfaces regulated by the side surfaces of the slits 33a and 33b, and its movement in the direction in which the space 33 extends (direction perpendicular to the plane of the paper in FIG. 9) is restricted; however, as shown in FIG. Sufficient clearances (backlash) are created in the vertical and horizontal directions of the connector housing 31, so that the connector housing 31 can be held freely within the connector housing 31.

The connecting contact 40, which is movably held within the connector housing 31 in this manner, is made of a conductive flat plate with a substantially H-shaped front view as shown in the figure, and the upper part has a conductive plate connected to the daughter board 7. A second connection part 41 is formed into which the contact part 21b of the second contact 21 is fitted and in contact with it, and the contact part 11b of the first contact 11 bonded to the motherboard 4 is fitted into the lower part and comes into contact with this. A first connection portion 42 is formed. Therefore, when the connecting contact assembly 30 is fixed to the motherboard 4, the contact portion 11b of each first contact 11 bonded to the land 4a of the first contact assembly 10 is fitted into the first connecting portion 42. It makes contact with the connecting contact 40. Further, when the board support groove 32 of the connection contact assembly 30 and the lower end of the daughter board 7 are fitted and the daughter board 7 is attached, each second contact assembly 20 connected to the land 7a of the daughter board 7 The contact 21 has its contact portion 21b connected to the second connection portion 4 of the connecting contact 40.
1 and comes into contact with the connecting contact 40. Therefore, the first
Contact 11 and second contact 21 are electrically connected. At this time, since the connecting contacts 40 are freely movably held within the connector housing 31, even if the boards 4 and 7 are warped or thermally strained, the connecting contacts 40
This can be absorbed by the free movement of the contact, and can prevent stress from acting on the joint between the contact and the land of the board.

It goes without saying that the method of freely retaining the connecting contact within the connector housing is not limited to the method shown in FIG. 9, but may also be other methods. . For example, as shown in Figure 10,
A support pin 34 made of an insulating material is supported by the connector housing 31'.
A hole 4 formed in the center of the connecting contact 40'
5, and the connecting contact 40' may be held by this support pin 34.

(Effects of the Invention) As explained above, according to the present invention, the first contact bonded to the first printed wiring board (e.g. motherboard) and the second printed wiring board (e.g. daughter board) The joined second contacts are connected to each other via a connecting contact that is movably held inside a connector housing that is fixed on the first printed wiring board and supports the second printed wiring board. Therefore, even if the printed wiring board is warped or thermally strained, these can be released by the loose movement of the connecting contacts, and this prevents stress from being applied to the joint between the first and second contacts. It can be prevented. Furthermore, by using the SURF S mount, it is possible to increase the mounting density of printed wiring boards.

[Brief explanation of the drawing]

1 and 2 are perspective views showing the SURF S-mount connector according to the present invention in a state before and after connecting printed wiring boards with this connector, and FIG.
FIG. 4 is a cross-sectional view showing the first contact assembly along the arrow - in FIG. 3, and FIG. 5 is a perspective view showing only the contact assembly.
6 is a sectional view showing the second contact assembly, FIG. 7 is a perspective view of the connector housing, and FIGS. 8 and 9 are views of the connector housing. FIG. 10 is a sectional view showing different examples of the connector housing, FIG. 11 and FIG.
FIG. 2 is a perspective view showing a printed wiring board, and FIG. 13 is a sectional view showing a conventional method of connecting printed wiring boards. 4...Motherboard, 5...Post header, 7
...Daughter board, 4a, 7a...Land, 1
0...first contact assembly, 11...first
Contact, 12...First contact holder, 2
0...Second contact assembly, 21...Second
Contact, 22...Second contact holder, 3
0... Connecting contact assembly, 31... Connector housing, 40... Connecting contact.

Claims (1)

[Claims] 1. A connector for connecting a second printed wiring board onto a first printed wiring board, the connector comprising a plurality of contact lands formed on the surface of the first printed wiring board. a plurality of first contacts that are bonded to each other and protrude outward from the surface thereof; and a plurality of first contacts that are bonded to and protrude outwardly from the surface of the second printed wiring board that are bonded to a plurality of contact lands formed on the surface of the second printed wiring board. a second contact; a connector housing fixed on the first printed wiring board and removably supporting the second printed wiring board on the first printed wiring board; and a connector housing movable within the connector housing. a plurality of connecting contact members held in the first
a first connection portion that contacts the contacts; and a second connection portion that contacts the second contacts when the second printed wiring board is supported by the connector housing.
A SURF S-mount connector characterized by having a connecting portion.